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Determination of paraquat by flow-injection spectrophotometry

✍ Scribed by Archana Jain; Krishna K. Verma; Alan Townshend

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
472 KB
Volume
284
Category
Article
ISSN
0003-2670

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✦ Synopsis

The solution obtained by oxidizing some of the ascorbic acid to dehydroascorbic acid by reaction with potassium iodate is used as a reagent for the reduction of paraquat to a blue radical cation in the flow-injection spectrophotometric determination of paraquat. A rectilinear calibration graph was obtained over the range 0.1-100 pg ml-' paraquat, and the limit of detection was 20 ng ml-' paraquat (signal-to-noise ratio = 3). This reagent has been found superior to ascorbic acid alone or sodium dithionite because of the lower limit of detection, wide linear range of determination, rapid reaction and high stability.

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